# KB4458621: August 2018 security update

KB4458621, released August 20, 2018, fixes 1 CVE in Microsoft SQL Server 2016 for x64-based Systems Service Pack 2 (CU). None of them is reported as exploited. Patch Radar priority: Urgent. The product is no longer supported.

- Web page: https://patchblox.com/security/fix/microsoft/kb4458621
- Platform: Microsoft
- Released: Aug 20, 2018
- Priority: Urgent (Closes CVE-2018-8273, rated Critical)
- CVEs: 1, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://support.microsoft.com/help/4458621

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Microsoft SQL Server 2016 for x64-based Systems Service Pack 2 (CU)](https://patchblox.com/security/data/product/microsoft/microsoft-sql-server-2016-for-x64-based-systems-service-pack-2-cu.md) |  |  |

## CVEs this fix closes

| CVE | Priority | Component | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2018-8273](https://patchblox.com/security/data/cve/CVE-2018-8273.md) | Urgent | SQL Server | n/a | 0.3116 |  |

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Data as of 2026-11-07T12:40:37Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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